linux-kernel - Re: [050/107] block: check for proper length of iov entries earlier in blk_rq_map_user

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Date:	Fri, 4 Nov 2011 22:36:14 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Greg KH <gregkh@...e.de>, Xiaotian Feng <dfeng@...hat.com>,
	Jens Axboe <jaxboe@...ionio.com>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk
Subject: Re: [050/107] block: check for proper length of iov entries earlier
 in blk_rq_map_user_iov()

On Fri, Nov 04, 2011 at 03:24:16PM +0000, Ben Hutchings wrote:
> > --- a/block/blk-map.c
> > +++ b/block/blk-map.c
> > @@ -201,12 +201,13 @@ int blk_rq_map_user_iov(struct request_q
> >  	for (i = 0; i < iov_count; i++) {
> >  		unsigned long uaddr = (unsigned long)iov[i].iov_base;
> >  
> > +		if (!iov[i].iov_len)
> > +			return -EINVAL;
> > +
> >  		if (uaddr & queue_dma_alignment(q)) {
> >  			unaligned = 1;
> >  			break;
> 
> I think the correct fix is just to remove the 'break'.
> 

Yeah.  I think you're right.  Are you going to send the patch?

regards,
dan carpenter


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